Ok, my understanding of power/electricity sucks. I understand how watts, amps, volts are somewhat related (ie amps=watts/volts). However that's pretty much where my understanding stops. My question is about the amount of servers being run on a power line at my co-location. Coming into the rack is a line that accepts a NEMA L5-20 input. Would it be ok to put a splitter on that line coming in so I have two NEMA L5-20 inputs instead of one? The reason I ask is because on the current single line coming in, we have a BayTech RPC9E-20NC with 20 servers connected. According to the RPC9 info we are using 16-18 or so amps. However if I split the line coming in and hook up two RPC9's, we can end up using 32+ amps. Will 32+ amps blow the single line coming in? It doesn't seem like it would to me, but I'm not 100% on any of it so I thought I'd ask.
Power/Electricity question
- Thread starter five40
- Start date
If you draw more current than the circuit breaker then it will blow.
Best bet would be two separate circuits from two separate PDUs. Then run your redundant power supplies to each circuit.
Best bet would be two separate circuits from two separate PDUs. Then run your redundant power supplies to each circuit.
well, it depends on what kind of 'line' you have coming in and what's hooked up to the other end. Normal house/building wiring usually is only around 15-20A before you start tripping breakers. If you have beefier mains and breakers, you might be able to pull 30-40A on that line.
This is the sort of thing where an electrician comes in handy (preferably the one that installed the stuff in the first place).
This is the sort of thing where an electrician comes in handy (preferably the one that installed the stuff in the first place).
Mattias, that is a 20 amp circuit...hence the NEMA L5-20
IMHO that's not nearly enough power for a single rack.
IMHO that's not nearly enough power for a single rack.
I have no idea what type of circuit it is. We are able to request the type of line we wanted run to our rack. We chose a line with a NEMA L5-20 connector on the end because that is what the RPC9 needed. Now we've outgrown the amount of connections a single RPC9 can hold. The line ends up going to some monster UPC unit (I kid you not it's bigger than a volkswagen bus).
L5-20 is a 120 volt, 20 amp circuit.
Not enough power for a rack unless you get two or more. So in your example you could just get two circuits, run those into your power strips/whatever they are and then separate the power supplies.
You have a single point of failure with just one circuit. It's normally done with dual/triple circuits to 2-3 separate PDUs.
-edit- plus if you are pulling 16-18 amps already you are just about to blow the breaker. Always keep current 80% below it's rating. If you do as I describe you will most likely lower that by distributing it between different circuits.
Not enough power for a rack unless you get two or more. So in your example you could just get two circuits, run those into your power strips/whatever they are and then separate the power supplies.
You have a single point of failure with just one circuit. It's normally done with dual/triple circuits to 2-3 separate PDUs.
-edit- plus if you are pulling 16-18 amps already you are just about to blow the breaker. Always keep current 80% below it's rating. If you do as I describe you will most likely lower that by distributing it between different circuits.
Could it be possible to have a NEMA L5-20 connector but a circuit that is 50 amps? For example I can put a connector on the NEMA L5-20 to convert it to a standard three prong plug. However the different plug doesn't mean that the circuit has changed. Remember, I'm totally clueless on lots of this stuff, so I'm just throwing out ideas. According to the data center, the power coming into the rack is enough for 40 servers.
no, L5-20 is a 20 amp plug. It is only good up to 20 amps.
Now you could mean NEMA L6-20 with is 220v/20 amp. But they are different plugs. They may look similar but they are "keyed" differently and are not interchangable.
Now you could mean NEMA L6-20 with is 220v/20 amp. But they are different plugs. They may look similar but they are "keyed" differently and are not interchangable.
Ok, so the plug would blow? Why would someone make this then: http://www.stayonline.com/detail.aspx?ID=7684 That's two 20 amp plugs going into one. What you are saying makes sense, but then this product would be useless. We've tried to get the data center to add another line coming in however they say they are maxed out on the number of lines they can add (the data center is full).
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